Ok. The last time i drove is when I got all the codes and lights from my last post. Today it started up again with no code lights on the dash or idrive. I got it on ramps and checked the ohms to ALL the transmission wires going into the plug with the multimeter again. I stuck one prong into the plug, the second prong I picked into the wire, more than a foot and half up from the plug. I had a 0.0 ohm reading with all the wires. (I also made sure the plug terminals are pushed out like they should be.) I then put dielectric grease on the plug end and plugged back into the mechatronic unit. Now immediately after starting the car, I have all the code lights back on, and now no light on the shifter knob. (It did start though)

So I almost sure if the problem is in this location, its in the mechatronic unit, not in the cable or plug leading to it. I just bought this car a year ago and this plug was messed with, so I presume they knew something that I dont... yet.

So my questions are: will I be able to check the mechatronic unit's internal plug somehow for continuity if I drop the valve body again? I know the unit is sealed. And yes, my biggest concern is unnecessarily tearing into a very expensive transmission, and not being the issue. Thats why I was hoping someone here might be able to help at least narrow it down using their experience, or by the code combination . It does have a new battery.

Let me also add again that the last few short drives were fine until about 50mph, going into 4th or 5th gear, pauses and then kicks itself down abruptly to a lower gear with "gear shifter malfunction". Thats gotta mean something or maybe coincidence? Idk...

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2007 (12/2006) X5 E70 3.0si / ZF GA6HP19Z